OBDII scan tool (excluding hand-held tester):

WARNING: This page is about a different car, the 2004 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY (OPERATE OCV)
1. Disconnect the C2 camshaft timing oil control valve connector.
2. Apply positive battery voltage between the terminals of the camshaft timing oil control valve.
3. Check the engine speed.
  Standard:
  
  Engine speed is rough idle or engine is stalled.
4. Reconnect the camshaft timing oil control valve connector.
  
  Fig 1: Locating C2 Camshaft Timing Oil Control Valve Connector Terminal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. NG: REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSY
  2. OK: GO TO NEXT STEP.

INSPECT ECM (OCV SIGNAL)

Inspection using the oscilloscope.

During idling, check the waveform between the terminals of the E3 ECM connector.

Standard:

TERMINALS OF E3 ECM CONNECTOR WAVEFORM CONDITION

Tester Connection	Specified Condition
OCV+ (E3-15) - OCV- (E3-14)	Correct waveform is as shown

Fig 2: Inspecting ECM (OCV Signal)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ECM (See REPLACEMENT )
OK: GO TO NEXT STEP.

CHECK HARNESS AND CONNECTOR (CAMSHAFT TIMING OIL CONTROL VALVE (OCV)-ECM)

Disconnect the C2 camshaft timing oil control valve connector.
Disconnect the E3 ECM connector.

Check the resistance between the wire harness side connectors.

Standard (Check for open):

CAMSHAFT TIMING OIL CONTROL VALVE CONNECTOR TERMINAL RESISTANCE (FOR OPEN)

Tester Connection	Specified Condition
Oil control valve (C2-1) - OCV+ (E3-15)	Below 1Ω
Oil control valve (C2-2) - OCV- (E3-14)	Below 1Ω

Fig 3: Locating C2 Camshaft Timing Oil Control Valve Connector

Standard (Check for short):

CAMSHAFT TIMING OIL CONTROL VALVE CONNECTOR TERMINAL RESISTANCE (FOR SHORT)

Tester Connection	Specified Condition
Oil control valve (C2-1) or OCV+ (E3-15) - Body ground	10 kΩ or higher
Oil control valve (C2-2) or OCV-(E3-14) - Body ground	10 kΩ or higher

Reconnect the camshaft timing oil control valve connector.
Reconnect the ECM connector.

Fig 4: Locating E3 ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS )